Nguwuphi umahluko phakathi kophawu lwevektha kunye nomthombo wophawu lweRF?

Umthombo wesiginali unokubonelela ngeempawu zovavanyo ezichanekileyo nezizinzileyo kwiinkqubo ezahlukeneyo zecandelo kunye nenkqubo yovavanyo. Ijeneretha yesignali yongeza umsebenzi ochanekileyo wokumodareyitha, onokunceda ukulinganisa umqondiso wenkqubo kunye nokwenza uvavanyo lokusebenza kommkeli. Zombini isiginali yeVektha kunye nomthombo wophawu lweRF zinokusetyenziswa njengomthombo wophawu lovavanyo. Ngezantsi sineempawu zabo phantsi kohlalutyo.
Nguwuphi umahluko phakathi kophawu lwevektha kunye nomthombo wophawu lweRF?
1. Intshayelelo kuMthombo weMiqondiso yeVector
Ijenereyitha yomqondiso weVektha yavela ngeminyaka yoo-1980, yaze yasebenzisa indlela yokumodareyitha yamaza omoya aphakathi adityaniswe nendlela yokuguqula kanomathotholo ezantsi ukuvelisa isiginali yokumodareyitha ivektha. Umgaqo kukusebenzisa iyunithi ye-frequency synthesis ukuvelisa isignali ye-oscillator yendawo eguquguqukayo eqhubekayo ye-microwave kunye ne-fixed frequency intermediate frequency signal. Isignali yefrikhwensi ephakathi kunye ne-baseband signal ingena kwimodyuli yevektha ukuvelisa i-intermediate frequency vector modulated signal kunye ne-fixed carrier frequency (i-carrier frequency is frequency of the point frequency signal). uphawu. Isiginali yefrikhwensi yerediyo iqulethe ulwazi lwebhendi efanayo neyesignali yokumodareyitha yefrikhwensi ephakathi. Isiginali yeRF ithi emva koko ibekwe kwimeko-bume yomqondiso kwaye imodareyithwe yiyunithi yolungiselelo lomqondiso, emva koko ithunyelwe kwizibuko lemveliso ukuze iphume.

Iyunithi engaphantsi yokwenziwa kophawu lweVector, iyunithi yokulungelelanisa umqondiso, inkqubo yokumodareyitha ye-analog kunye neminye imiba iyafana nejenereyitha yomqondiso eqhelekileyo. Umahluko phakathi kwejenereyitha yesiginali yevektha kunye nejenereyitha yesiginali eqhelekileyo yiyunithi yokumodareyitha iVector kunye neyunithi yokuvelisa umqondiso wesiseko.

Njengokumodareyitha kwe-analog, ukumodareyitha kwedijithali nako kuneendlela ezintathu ezisisiseko, ezizezi, ukumodareyitha kwe-amplitude, ukumodareyitha kwesigaba kunye nokumodareyitha rhoqo. Imodyuli yeVektha idla ngokuqulatha iiyunithi ezine ezisebenzayo: iyunithi yolwahlulo lwamandla lwe-oscillator 90 ° isigaba-shifting iguqula igalelo lomqondiso weRF ube ziisignali zeRF ezimbini ze-orthogonal; iiyunithi zokuxuba ezimbini ziguqula i-baseband ekwisigaba sophawu kunye ne-quadrature yesiginali Phinda-phinda ngophawu lweRF oluhambelanayo ngokulandelelanayo; iyunithi yokudityaniswa kwamandla ishwankathela imiqondiso emibini emva kophindaphindo kunye neziphumo. Ngokuqhelekileyo, zonke izibuko zegalelo kunye nemveliso zipheliswe ngaphakathi kunye nomthwalo we-50Ω kwaye zamkele indlela yokuqhuba isignali eyahlukileyo yokunciphisa ilahleko yokubuyisela i-port kunye nokuphucula ukusebenza kwe-modulator ye-vector.

Iyunithi yokuvelisa umqondiso we-baseband isetyenziselwa ukuvelisa isignali ye-baseband efunekayo yedijithali, kwaye i-waveform enikezelwe ngumsebenzisi inokukhutshelwa kwimemori ye-waveform ukuvelisa ifomathi echazwe ngumsebenzisi. I-baseband signal generator idla ngokuba neprosesa eqhumayo, i-data generator, i-symbol generator, i-finite impulse response (FIR) filter, i-resampler yedijithali, i-DAC, kunye nesihluzo sokuvuselela.

2. Ukwaziswa komthombo wophawu lweRF
Itekhnoloji yale mihla yokudityaniswa kwamaza kaninzi isebenzisa indlela engangqalanga yodityaniso ukudibanisa ukuphindaphinda komthombo oyintloko wokungcangcazela kunye nokuphindaphindwa kwereferensi yomthombo wamatyeli ngesangqa esitshixekileyo. Ifuna izixhobo ezincinci zehardware, ukuthembeka okuphezulu, kunye noluhlu olubanzi lwamaza. Undoqo wayo sisigaqa esitshixekileyo, kwaye umthombo wophawu lweRF ngumbono obanzi. Ngokubanzi, nawuphi na umthombo wophawu onokuthi uvelise isiginali yeRF unokukhwela kumthombo wophawu lweRF. Imithombo yangoku yeempawu zevektha ubukhulu becala ikwibhendi yeRF, ngoko ke ikwabizwa ngokuba yimithombo yeempawu zevektha yeRF.

Okwesithathu, umahluko phakathi kwemiqondiso emibini
1. Umthombo wesignali yerediyo esulungekileyo usetyenziswa kuphela ukuvelisa iisiginali zerediyo ze-analog enye yefrikhwensi, kwaye ngokuqhelekileyo ayisetyenziswa ukwenza iisignali ezimodareyithiweyo, ingakumbi iisignali ezimodyuliweyo zedijithali. Olu hlobo lomthombo wesignali lunebhendi yefrikhwensi ebanzi kunye noluhlu lwamandla amakhulu.

2. Umthombo wesiginali ye-vector usetyenziswa ikakhulu ukuvelisa imiqondiso ye-vector, oko kukuthi, imiqondiso yokumodareyitha esetyenziswa ngokuqhelekileyo kunxibelelwano lwedijithali, njenge-l / Q modulation: ASK, FSK, MSK, PSK, QAM, customized I / Q, 3GPPLTE FDD kunye TDD, 3GPPFDD / HSPA / HSPA +, GSM / EDGE / EDGE evolution, TD-SCDMA, WiMAX? Neminye imigangatho. Kumthombo wesiginali yeVector, ngenxa yemodyuli yebhendi yangaphakathi, i-frequency ayixhomekanga kakhulu (malunga ne-6GHz). Isalathisi esihambelanayo se-modulator yayo (efana ne-bandwidth yesignali ye-baseband eyakhelweyo) kunye nenani leziteshi zesignali yisalathisi esibalulekileyo.

Ukuziphendulela: Eli nqaku linqaku elishicilelwe kwakhona. Injongo yeli nqaku kukudlulisa ulwazi oluninzi, kwaye i-copyright yeyombhali wokuqala. Ukuba iividiyo, imifanekiso, kunye neetekisi ezisetyenziswe kweli nqaku zibandakanya imiba yamalungelo okushicilela, nceda uqhagamshelane nomhleli ukuze ujongane nazo.